Malicious PDF — malware analysis report

Static analysis result for SHA-256 d935b6311a9394ea…

MALICIOUS

PDF

77.3 KB Created: 2021-06-01 02:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c5999a6b00523ef3867d085a174ebf5 SHA-1: f512dec0506a30ecb77cb4c5e9dc3f14f010e53a SHA-256: d935b6311a9394ea3689c2305ae52293bd38b6155d921e117f5b516a292453a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic indicating it is part of a link farm, with numerous external links. One prominent URL, 'https://pistant.ru/pbw?utm_term=alphabet+anglais+phon%25C3%25A9tique+tableau+pdf', is directly embedded. ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further supports its malicious nature. The document body, though heavily garbled, suggests a lure related to an 'alphabet phonetic table'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/pbw?utm_term=alphabet+anglais+phon%25C3%25A9tique+tableau+pdf
    • https://cdn-cms.f-static.net/uploads/4458848/normal_600d30fab4991.pdf
    • https://cdn-cms.f-static.net/uploads/4496811/normal_6042d12485f5d.pdf
    • https://static.s123-cdn-static.com/uploads/4479917/normal_5ff4129784695.pdf
    • https://cdn-cms.f-static.net/uploads/4504568/normal_5fd972a74500a.pdf
    • https://bonawoxe.weebly.com/uploads/1/3/3/9/133986387/5372351.pdf
    • https://cdn-cms.f-static.net/uploads/4459035/normal_6031e81710cf1.pdf
    • https://static.s123-cdn-static.com/uploads/4401540/normal_5ff9eb770bd98.pdf
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/saxazakiluge.pdf
    • https://wusafasugulub.weebly.com/uploads/1/3/4/5/134586051/tefuwokulifad.pdf
    • https://cdn-cms.f-static.net/uploads/4378152/normal_602ff2d92692a.pdf
    • https://cdn-cms.f-static.net/uploads/4452863/normal_60558d1575cee.pdf
    • https://fozikevogakol.weebly.com/uploads/1/3/1/4/131437046/punakuroxiliv-kilegivebekera-govelogulowesun-xafugit.pdf
    • https://static.s123-cdn-static.com/uploads/4367640/normal_5fef55e4812ad.pdf
    • https://jevavuxenexek.weebly.com/uploads/1/3/5/3/135351486/zejigatopuvovog.pdf
    • https://batatebuve.weebly.com/uploads/1/3/4/6/134676181/nuzubujure-tuvexo.pdf
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/6256062.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/94f1f620-4a72-4085-8653-65cf7a640093/vitagaxukalazumomig.pdf
    • https://uploads.strikinglycdn.com/files/364fc666-3b7b-4813-bc96-196373d10b93/pominorovuvis.pdf
    • https://uploads.strikinglycdn.com/files/6f51f053-1af7-42dc-839b-2d11d85852aa/tamisete.pdf
    • https://uploads.strikinglycdn.com/files/bd51f3e8-0e77-4c1d-9f5a-9b0a7e295d35/90414957897.pdf
    • https://uploads.strikinglycdn.com/files/d443ab1e-1324-4eed-a9f3-5e01027eb486/dikorasevo.pdf
    • https://uploads.strikinglycdn.com/files/6f860441-5bef-42eb-a761-bc9face5f934/nlp_techniques_python.pdf
    • https://uploads.strikinglycdn.com/files/2cd5ab14-05ab-43ac-9b3d-20d8135e0599/64971374326.pdf
    • https://uploads.strikinglycdn.com/files/e0150db4-99ea-4b61-8150-17cd9026788f/what_is_the_cost_of_ipratropium-albuterol.pdf
    • https://uploads.strikinglycdn.com/files/9dc8cd4e-7a06-40e2-8a0b-28222383d0c1/waterboss_water_softener_model_900_troubleshooting.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67c.bin
c4b743f21f58ad42ba75a40c2b969bfb83038e20bd56e175c0e784122ff228e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 5604 bytes
font_01_sfnt_off0000f93a.bin
e0dcb283245367d270d5537ccbc77de6badad4d02b9566488717bb50b6f3c186		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 14016 bytes

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